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ACQUISITIONS ACQUISITIONS (Details 3) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Assets acquired:      
Goodwill $ 686,271us-gaap_Goodwill $ 688,489us-gaap_Goodwill $ 542,114us-gaap_Goodwill
Other Acquisitions [Member]      
Assets acquired:      
Goodwill 2,552us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
68,095us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
18,499us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Identifiable intangible assets 3,400us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
39,843us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
21,831us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Accounts receivable 251us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
9,233us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
4,390us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Property, plant and equipment 248us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
6,286us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
1,361us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Inventories 250us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
3,112us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
4,688us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Other assets 70us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
2,565us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
171us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Total assets acquired, excluding cash 6,771us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
129,134us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
50,940us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Liabilities assumed:      
Accrued additional purchase consideration 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
21,223us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
11,982us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContingentLiability
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Deferred income taxes 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
13,857us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Accrued expenses 12hei_AccruedExpensesAssumed
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= hei_OtherAcquisitionsMember
3,846hei_AccruedExpensesAssumed
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
645hei_AccruedExpensesAssumed
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Accounts payable 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
1,746us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
445us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Other liabilities 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
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= hei_OtherAcquisitionsMember
Total liabilities assumed 12us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
40,672us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
13,072us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Noncontrolling interests in consolidated subsidiaries 0us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
0us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
3,918us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
Net assets acquired, excluding cash $ 6,759hei_IdentifiableassetsacquiredexcludingcashGoodwillandLiabilititesassumed
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
$ 88,462hei_IdentifiableassetsacquiredexcludingcashGoodwillandLiabilititesassumed
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember
$ 33,950hei_IdentifiableassetsacquiredexcludingcashGoodwillandLiabilititesassumed
/ us-gaap_BusinessAcquisitionAxis
= hei_OtherAcquisitionsMember